Jumprings

Jumprings are round (or oval) rings that you use to attach items to each other, like a clasp to a necklace. They have many, many uses. Jumprings come in "open" - with a split so that you can open them, "closed" - permanently soldered shut, and split rings, which are like the rings that you slide your keys onto.

Remember to only open a jumpring by twisting the ends open, never by pulling apart, as this weakens the metal and it never closes up again correctly.